Foot rest



FIG. 1 is a perspective view of a foot rest showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is an elevation view thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken lines in the drawings showing the word logo form no part of the claimed design. 

The ornamental design for a foot rest, as shown and described. 